Anguillicolosis: dynamics of the infection over two decades

The dynamics of the infection of the European eel Anguilla anguilla L. by the Asian nematode Anguillicola crassus Kuwahara, Niimi and Itagaki, 1974 (i.e. anguillicolosis) was monitored over 2 decades in an oligohaline canal in southern France (Camargue, Mediterranean coast). Since the first mention...

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Bibliographic Details
Published in:	Diseases of aquatic organisms Vol. 62; no. 3; pp. 227 - 232
Main Authors:	LEFEBVRE, F. S, CRIVELLI, A. J
Format:	Journal Article
Language:	English
Published:	Oldendorf Inter-Research 13-12-2004
Subjects:	Air Sacs - parasitology Anguilla Anguilla anguilla Anguillicola crassus Animal helminthic diseases Animals Biological and medical sciences Dracunculoidea Fish Diseases - epidemiology Fish Diseases - parasitology France - epidemiology Helminthic diseases Infectious diseases Longitudinal Studies Medical sciences Nematoda Parasitic diseases Population Dynamics Prevalence Seasons Spirurida Infections - epidemiology Spirurida Infections - veterinary France Europe France, Camargue MED, France Edible fish Host parasite relation Anguilla anguilla Epidemiology·Anguilla anguilla·Anguillicola crassus·Host-parasite system Epidemiology Long term Infection Vertebrata Regulation process Pisces Helmintha Nemathelminthia Invertebrata Sanitary surveillance Nematoda
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Summary:	The dynamics of the infection of the European eel Anguilla anguilla L. by the Asian nematode Anguillicola crassus Kuwahara, Niimi and Itagaki, 1974 (i.e. anguillicolosis) was monitored over 2 decades in an oligohaline canal in southern France (Camargue, Mediterranean coast). Since the first mention of the parasite in this canal in 1985, which was also the first record in France, prevalence of pre-adult and adult forms has risen from 32 to 73%. However, during the last 7 yr (1997 to 2003), prevalence seems to have stabilized around values of 60 to 70% and parasite load, though inter-annual variation is substantial, shows no sign of increase (intensity for the last 5 yr: min. = 3.70, max. = 9.66, mean = 6.01). Our results thus confirm the dynamic pattern observed elsewhere in Europe, i.e. a rapid spread following the introduction of the parasite in a water system and then stabilization around ceiling levels. We review possible mechanisms that may explain such a leveling off in the infection spread. We particularly document the possibility that repetitive infections may render the infected organ, i.e. the swimbladder, unsuitable for further A. crassus establishment. In support of this hypothesis, we showed that the infection rate is lower among eels with severely damaged swimbladders.
Bibliography:	ObjectType-Article-2 SourceType-Scholarly Journals-1 ObjectType-Feature-1 content type line 23 ObjectType-Article-1 ObjectType-Feature-2
ISSN:	0177-5103 1616-1580
DOI:	10.3354/dao062227